Thanks AntieEm,
Maybe I should just go ahead and order a likely certficate from GRO?
I have had another email from Dudley  stating that they are not aware of any Quinton births in their registers  and that none of the three possible births from BMD matched any of the 'clues' I was looking for
ie...
   --  working back from the 1901 and 1911 census would put his date of birth in 1878.. and his place of birth as Quinton.
   --  he names his father as Joseph Taylor ( a labourer) on his marriage certificate
   --  and he may be the William Taylor I found on the register for Quinton Church School,  whose birthdate was listed as ...8 Feb 1878....parent/guardian Elizabeth Taylor nailer.. residence Quinton. 
They did suggest that because of the shifting boundaries  some records have ended up in different offices.
If I do a search on West Midlands BMD for 1878  I get the following...
West Midlands Birth indexes for the years: 1878
Surname 	Forename(s) 	Sub-District 	Registers At 	Reference
TAYLOR 	William G 	Walsall 	Walsall Register Office 	WAL/096/68
TAYLOR 	William H 	Dudley 	Dudley Register Office 	DUD/153/494
TAYLOR 	William T 	Stourbridge 	Dudley Register Office 	STO/071/403
TAYLOR 	William 	Bloxwich 	Walsall Register Office 	BLX/029/083
TAYLOR 	William 	Oldbury 	Sandwell Register Office 	OLD/58/156
TAYLOR 	William 	Oldbury 	Sandwell Register Office 	OLD/59/341
TAYLOR 	William 	Oldbury 	Sandwell Register Office 	OLD/59/466
TAYLOR 	William 	Rowley Regis 	Sandwell Register Office 	RR/70/67
TAYLOR 	William 	Sedgley 	Dudley Register Office 	SEG/125/372
TAYLOR 	William 	Stourbridge 	Dudley Register Office 	STO/072/166
TAYLOR 	William 	Stourbridge 	Dudley Register Office 	STO/072/20
TAYLOR 	William 	Wednesbury 	Sandwell Register Office 	WED/68/373
TYLER 	William 	Sedgley 	Dudley Register Office 	SEG/125/392
I don't know if any of the other offices are likely candidates for being where the birth certificate would be?
Not sure what to do next with this 
 
 Expat